Press for drawing hollow ware of sheet metal



May 24, 1927.

3' Sheds-Shut 1 Filed Feb. 20. I926 Flej.

Cunt-51mm Rm:-

May 1927' c. J. RHODES PRESS FOR DRAWING HOLLOW WARE 0F SHEET METAL Filed Feb 20. 1926 s Sheets-Sheet v rrTl 9mm 0mm. E5 JafEPl/ P/mass May 24, 1927'.

. 1,629,839 c. J. RHODES PRESS FOR DRAWING HOLLOW WARE 0F JS HEET METAL Fild Feb.20, 192s s sheds-sings] 0 'fcg I -45 #52 2! c- T F|G.3.

FIGA.

0mm as Jsern mm.

Patented May 24, 1927.

omen. STATES CHARLES JOSEPH RHODES, OEWAKEFIELD, ENGLAND.

rRnss non nnawine HOLLOW wean or snnn'r METAL.

Application filed February 20, 1326, Serial No 89,572, and in Great Britain February 24, 1925.

This invention relates to presses for drawing hollow ware of sheet metal, for instance,

vessels or receptacles of considerable depth in one or more stages in a single stroke of the press, whilst maintaining uniform pressure on the work during the entire drawing operation for example as disclosed in Letters Patent Nos. 1,519,333 and 1,561,770.

The object of the present invention isto provide improved operating and controlling mechanism for the drawing or pressure member or members of the stationary die and associated bufier device or devices where the latter are provided;

One feature of the invention comprises improved mechanism for controlling the movement of a drawing or pressure mem:

ber of the stationary die without the use of a rotary cam, by supporting said pressure:

a table, with or withoutinterposed resilient buffer device, and providing locking means for the table comprising one or more wedge elements each supported by a member, movable to member on a reciprocatn release the element, by means of slides hav-.

ing inclined surfaces and moving in an angular path relatively to theaxis of the press. The said slides are operated in conjunction with the ram or movable die of the press, in such a manner that movement of the table and consequently of the drawing or pressure member is prevented until the movable die actually work placed on the stationary throi whereupon the locking means is released, al-

lowing said table and drawing memberto;

- tion of movement of the ram and an angular I portion intermediate said parts (Figure recede for effecting the drawing operation. Another feature of the invention relates to those forms of presses in which a plurality of drawing members, for example two such, are provided for operations as disclosed in the above mentioned Letters Patent No. comprises improved cam and butter-"mechanism for said second or redraw member in which the buffer and cam and associated parts are so arranged as to provide a solidresistance when said redraw member acts as a forming member and a resilient pressure when said member acts as a pressure member only.

The invention also comprises other details of construction, arrangement and combination of parts, set forth in the appended claims and hereinafter fully deoperates with makes contact with the die, and. 'h same with the drawing member;

- said guideways having draw and redraw said block's being constructed' integral with 1,561,770, and;

"from opposite sides thereof the table" being vertically scribed with reference to the accompanying sectional view showing parts of the mecha nism for supporting the table for the first drawing member and Fig. 4 is a sectional detail view of camand butter for the second or redraw member.

To refer more particularly to Figs. 1 and 2 of the drawings 1 designates the frame of thepress comprising the base 2 and vertical side members 3 between which latter the ram is vertically slidable, the operating means for the ram being not which may be of any approved type. The ram 4; carries the upper die 5 which cothe lower die 6 supported on 7 the said dies being disclosed in Letters 1,561,902 for drawing a cross framemember suitably of the type Patent 1,561,770 and the hollow ware in two successive stages in a single stroke of the press. The ram is guided in the side frame members 3 by extensions & on the rain extending through slots in said members and to said extensions are adjustably connected rods 8 pivoted to'other connecting rods 9 the latter at their lower ends being pivoted to wedgefshaped or blOClZS or slides 10 mounted 7 diamond shaped and guided for sliding movement in guide- ,way's in the side members of the base, parts 1F and 11 arranged ina plane extending in the direc- T-he inclined faces of the slides 10 co-operate with similarly inclined faces of blocks 12 wh ch also engage in the guideways 11,

or fixed to a table 13 to extend laterally through the frame members, slidable in the fame and supporting pins or rods 6 carrying the'outer draw ring or member 6" of the lower die. The table is normally supported in position with the drawing member 6" in a plane with the top of the stationary die by abutments in the form of slides 114 for the releasable engagement of the blocks 12,said slides being guided for horizontal transverse movement in guides 'on the frame and having at the Fig. 2 is a shown but center opposite bridge pieces 16 for the engagement and passage thcrebetween of the diamond shaped slides 10.

Thus so long as the ram 1- is in its upper position and the dies are separated as shown in Fig. 1 the table 13 and consequently the drawing member 6" are maintained. in nor-- inal elevated position but at the correct movement, that is to say when the upper movable die 5 makes contact with the work on the lower. die 6 by descent of the ram, the diamond slides 10 travel from the path 11 of the guideways 11 through the angular portion of the guideways to the path 11 of said guideways and during this movement co-operating with the bridge piece 16 of the abutment slides 14 to move said slides transversely. This horizontal movement of slides 14 releases the wedge blocks 12 and on continued downward movement of the ram consequently permits descent of the table and, with the latter the descent of the draw ring 6 to permit the drawing operation, or in the embodiment of the present machine the first stage of such drawing operation. The diamond slides 10 all the while remain below the blocks 12 and as the rain again rises after the end of its downwai 'd stroke the said slides will lift the blocks 12 in path 11 and with them the table and draw ring 6" and will also move back the transverse slides 14 so that the latter are caused to again support the blocks, and the table and become locked, the diamond slides then continuing their upward travel in path 11 until the ram reaches its uppermost position ready for a new stroke. It should be noted that the supporting stress of the table as it descends is taken by two inclined faces viz 1O on the diamond slide and 12 on the wedge block which cannot slip due to the fact that both are guided in a common path 11 whichv laterally supports the slide 10 and block 12 in their movements.

So far the detail description has related only to the control of a single draw member 6 and in presses having only one such member for single drawing operations the control of said drawing member is terminated by the means described, but in forms of presses in which the drawing operation is performed in a number of stages by a plurality of draw members or rings, two such being shown in the present embodiment, it is also necessary to control the said second draw member and the invention further comprises improved means for this purpose.

The second draw or redraw member is designated 6 in Fig. 1 and its supporting pins 6 extend downwards through the outer block of the lower die and are supported by a block 17 or equivalent which is carried a stem or spindle l8 adjustably mounted on a screw spindle 19 tapped into a casting or block 20 slidable relatively to the table 13 and which carries a roller 21 bearing on the periphery of a controlling cam 22. This cam is loosely mounted on a shaft 23 on which is rigidly mounted a disc or plate 24, adjustable connections as by bolts and slots 25 being made between the cam and disc in order that the angle of the latter on the shaft may be varied to control the time of operation of the redraw member 6 relatively to the first draw member 6. The shaft 23 is oscillated by means of pinions 26 thereon engaging racks connected to the table 13.

The casting 2O aforesaid is associated with abutler device which is arranged to give a solid support to the redraw member 6 dur ing the first drawing operation, that is to say, whilst the first draw member 6" is receding and the redraw member is acting as a former, and also a resilient pressure support to the redraw member during the sec ond drawing operation, that is to say, when it is receding and acting as a pressure member only.

F or this purpose the' buffer device comprises a resilient or rubber cushion 26 surmounted by a metal plate 27 adapted to have a limited vertical movement relatively to the casting 20 and the pressure of said cushion may be varied by a plate 28 below the cushion under the action of screwed washers 29. The spindle 19 is free in the casting 20 but is screwed into plate 27 and held by a nut 27.

The cam 22 is of special contour as inclicated in Fig. 41- which permits a telescopic action of the plate 28 to come into effect and the cushion to expand to take the required,

pressure for drawing such pressure being adjusted by the washers 29.

The cushion is thus held between the two plates 27 and 28 and when the redraw member 6 is being used as a forming member the cam presses the cushion through the roller 21 and casting 20 and through the'spindl 18 offers a rigid resistance to the redraw member (see Fig. 4-). When however the roller 21 comes to a slightly dropped posi tion 24- of the cam preceding the position 22 controlling the redraw movement of the ing the rubber cushion 26 to expand sotliat at the moment the redraw member actually functions as a pressure member (redraw op eration commencing) the cushion is permitted to exert resilient pressure on the redraw member and consequently on the work which will be sufticient for drawing purposes. c

I do not limit myself to the exact construction arrangement or combination of parts hereinbefore described or illustrated in the drawings since the same may be varied within limits presented by the appended pressure member the casting 20 falls allowwith the slidably mounted claims without departing from the spirit of the invention.

What I claim as my invention and desire to secure by Letters Patent of the United States is 1. In a draw press, a die embodying a stationary member and a member movable relative thereto, a movable die co-oper ating with the stationary member of the first die to effect a drawing of work placed relative to said die, a movablecarrier for the drawing member embodying a 'slidably mounted element, a slide movable transversely of the slidably mounted element of tlvmdrawing member carrier and normally positioned for engagement by said element to hold the drawing member carrier against movement, and a slidably mounted member operating in unison with the movable die to co-operate with said transversely movable slide to move the same out ofengagement element of the carrier to release the carrier and permit the carrier with the drawing member to participate in the movement of the movable die and recede relative to its co-operating stationary die member to effect the. drawing of the work over said latter member.

In a draw press, a die embodying a fixed member and a drawing member movable relative to the fixed member, a movable die co-operating with said fixed die member to effect a drawing of work placed on said fixed die member, a movable table adapted to support the drawing member, blocks connected with and normally supporting said table, slides movable transversely of and normally engaged by said blocks to support the table, and slidable members operating in unison with the movable die and have movement in an angular path relative to t'heaxis of the press, said members having inclined surfaces to co-operate with said transversely movable slides to move the same outof supporting engagement by the blocks to release the table and move said inclined surfaces into supporting engagement with the blocks and permit of receding movement of the table with the drawing member in unison with the movable die.

In a draw press, a stationary die and adrawing member movable relative thereto, a movable die co-operating with said stationary die to effect a drawing of work placed on said latter die, a table on which the drawing member is supported, blocks connected to and supporting the table slidably mounted to have movement in the direction of the movable die and having an inclined face extending at an angle to its direction of movement, slides movable transversely to the movement of the blocks for engagement by and releasably support the blocks, slidable members operating in unison with the movable die and having instationary die to effect a clined surfaces, and guideways for said slidable members having a part extending in angular relation to the aXis of the press for engagement of the inclined surface of said members to impart movement thereto in angular direction to the movementof the move able die and during said movement co-operate with the transversely movable slides to move the same out of engagement with the blocks to release the table and co-operate with the inclined face of the blocks to support and permit the table to recede-with the drawing member, and said engagement of the slidable members with the blocks also acting to return the table to normal position after. the drawing operation.

4-. In a draw press, a stationary dieand a' drawing member movable relative thereto, a movable die cooperating with said staionary die to effect a drawing of Work placed on saidlatter die, a carrier for the drawing member movable in the direction of the movable die, said table being ar' ran e ed with laterally extending blocks hava face inclining to the direction of movement of the table, slides" movable transversely of and for engagement by the table. blocks to normally support the table, and slides movable in unison with the movable. die and having inclined surfaces to co-operate with said transverse slides to move the same out of engagement with the table blocks, and release the table when the movable die contacts .with the work on the stationary die, and. co-operate with the carrier blocks to permit said carrier with the drawing member to recede from the fixed die member in unison with the movement of the movabledie.- V V 5. In a draw press, a stationary. die and a drawing member movable relative thereto, a reciprocatory die to co-operate with said stationary dieto effect a drawingof work placed on said latter die, means movable in the direction of the reciprocat'ory die adapted to carry the. drawing member arranged with partshaving a face inclined to the direction of movement of said carrying means, slides movable transversely of the movement of said carrying means and normally positioned for engagement of the parts having the inclined face to support the table, and slides operating in unison with the reciprocatory die and having inclined surfaces to co-operate With said transversely 1 movable slides to move the same out of sup porting position for and release thecarrymg means to permit the latter with the drawing member to recede from the fixed die memher in unison with the movement of the reciprocatory member.

6. In a draw press, a stationary die and a drawing member movable relative thereto, a reciprocatory die co-operati1 1g with said drawing of Work placed" on said latter die, movable means adapted tocarry the drawing member arranged with parts having. a face inclined to thedirection of movement of said carryingmeans, slides movable transversely of the movement of and normally engaged by thepartsiof.thecarrying means having the inclined faceto s-upportjs aid drawing member carrying means, and. slides operating in unison w th thereciprocatory die and" having. opposite "inclined surfaces, said slides engaging-in guideways having a part extending in angular relation to the ZLXIS of thetpress and co-operating with said transversely movable slides to move the same out of engagement with the parts having the inclined face of the drawing member carrying means torelease said carrying'means and co-operating with the inclined face of said parts of the drawing member carrying "means tosupport and permit said carrying means to participate in the movement of the reciprocatory die .when said die contacts with the work on the stationary die, andsaid slides also acting to return the carrying means to normal position and the transverse ly'movable slides to supporting position for the drawing member .carrying means [after the drawing operation.

7. In a draw press having a stationarydie' provided with a plurality of relatively movablereceding drawing members, and a movable die cooperating with said drawing members to effectra drawing operation in a succession of stages iii-asinglexstroke of the press, the combination of a' movable table adapted to support one}. of said drawing members, holding means for said table operaresistance is provided therefor when-said member acts as a. drawing member.

8. In a draw press" having a stationary I die provided with two relatively movable and successively acting drawing members for effecting draw and redraw operations on the work' during a single stroke of the press, the combination of a reciprocatory table adapted to support the draw member during the draw operation holding unison means forjsaid table operating in with; the-movable die adapted to maintain same stationary until the movable the engages the work on the stationary die,'cam and resilient buffer means wherebya solid resistance is provided for the -redraw member wh'en the same acts as a formenaisl a resilient resistance when said member acts as a pressure element during a redraw ng operation, sa d buffer means being fully compressed during. the draw operation, and permitted freedom of resilient action during the redraw operation by the contour of the cam.. 9. In a draw fixed able relative to the fixed member, a ram; carrying a the latter to effect a drawing of work placed relative thereto, a carrier for the drawing member. movablein the direction of move merit of the ram, abutment means movable transverselyLofthe movement of the carrier for the drawing member adaptedfor the releasable engagementand support of the? carrier, and means operative in unison with the ram to movethe abutment means out of carrier supporting position andsupport ajndpermit movement of the carrier in uniso a I tion and th gthe ram during the drawing operaic pate in the receding m0ve-' on and move the abutment to j'carr-iersupporting position during said latter .movement. a In witness whereof I have signed this specification.

oriaetia's' JOSE iH- RHODES,

press, a die embodying a. member and a drawing membermovdie reciprocatory. toward and away from the first die to co-operate w th;

n to return the drawing mem- 

